Has anyone had this problem that can help? I have a Horizon that sewed perfect up til a couple of weeks ago. I jammed some polar fleece fabric into the needleplate and had to remove it to cut the fabric out. After that (could be a coincidence though), my machine has not been sewing properly. It was making a loop on the underside of the fabric every few inches or so. I was using the same thread, and same cotton quilting fabric like I've used for the last 2 years and it wasn't a problem before so I don't think that's the problem now. I cleaned every speck of lint, tried different needles, re-threaded top and bottom a dozen times, tried sewing on different tension settings (but it's always sewed great on AUTO), "flossed" the tension discs and it still was doing it. I even switched the needleplate and bobbin case with one from a new horizon that a lady has in my quilting group and it still looped. So I blew out the top tension discs with some canned air (a no-no I know but I'm desperate at this point)and found more lint in the bobbin area and tried sewing again and the stitch has improved (the loops have for the most part disappeared) but it still has areas of loose and wonky uneven stitches every few inches (like it will have maybe 3 or so looser stitches and then a few inches of nice stitches, then a couple of crooked stitches, another few inches of nice stitches etc etc). Frustrated!!! Does anyone have any idea what the problem might be? I can't take it apart to check those tension discs for a stray thread or fuzz although they look clean when I shine a flashlight through there. I don't know what else it could be and I don't see a bit of fuzz in the bobbin area anymore. I filed a couple of bumpy areas down on the bobbin case, but it still isn't working. I do have a new bobbin case on order but like I said, I tried the new one from the other machine and it still did it. UGH!!! I do believe I am threading it properly as I've been threading it the same as always so it's got to be something else. I just wanted to see if anyone here had any suggestions before I take it to the nearest dealer over 2 hours away.